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Air carrier large transport received a TCASII RA and wonders why ATC did not get a warning of the perceived close proximity.
| Attributes | |
| ACN | 198188 |
| Time | |
| Date | 199201 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 30000 flight time type : 4000 |
| ASRS Report | 198188 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 100 flight time total : 4500 flight time type : 13 |
| ASRS Report | 198436 |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 400 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
Received TA on TCASII. Several seconds later received RA on TCASII. Had visual at this point. Missed by approximately 400 ft. We were at 11000/250 KTS wbound, other aircraft at 10000 ft eastbound. Second aircraft also was air carrier aircraft -- either large transport or widebody transport, was on frequency 119.05 MHZ. Told approach control about problem (near miss). He asked if I was at 11000 ft. Said either aircraft was at 10000 ft. Approach control did not call this near miss to our attention. TCASII is what alerted us to incident. Elapsed time approximately 6 seconds. Why didn't ATC get alarm?
Original NASA ASRS Text
Title: ACR LGT RECEIVED A TCASII RA AND WONDERS WHY ATC DID NOT GET A WARNING OF THE PERCEIVED CLOSE PROX.
Narrative: RECEIVED TA ON TCASII. SEVERAL SECONDS LATER RECEIVED RA ON TCASII. HAD VISUAL AT THIS POINT. MISSED BY APPROX 400 FT. WE WERE AT 11000/250 KTS WBOUND, OTHER ACFT AT 10000 FT EBOUND. SECOND ACFT ALSO WAS ACR ACFT -- EITHER LGT OR WDB, WAS ON FREQ 119.05 MHZ. TOLD APCH CTL ABOUT PROBLEM (NEAR MISS). HE ASKED IF I WAS AT 11000 FT. SAID EITHER ACFT WAS AT 10000 FT. APCH CTL DID NOT CALL THIS NEAR MISS TO OUR ATTN. TCASII IS WHAT ALERTED US TO INCIDENT. ELAPSED TIME APPROX 6 SECONDS. WHY DIDN'T ATC GET ALARM?
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.